What happens when batteries of different capacities are used together?
If different capacities or old and new batteries are used together, there may be leakage, zero voltage, etc. This is because some of the batteries are overcharged during charging due to the difference in capacity during charging. Some batteries are not fully charged. When the battery is discharged, the battery with high capacity is not discharged, and the battery with low capacity is over-discharged. In such a vicious circle, the battery is damaged and leaks or low (zero) voltage.